How can you tell your boyfriend your pregnant?

No Im not pregnant. But the girl in my story is. in my story Abby the main character just found out shes 4 weeks pregnant, she is going to a hospital to get an abortion but decided against it and wants to tell her boyfriend Christopher. They have only been dating for three months but have been secretly in love with each other for nine months. What should she do? How can she tell him? Thanks. Please give serious answers, most people dont.